The Uniweld MTF-9 Cap’n Hook is a multi-flame brazing tip that wraps a flame around copper tubing, aimed at HVAC and refrigeration brazing up to about 2 inch tube. It is a good fit if you already run an oxy-acetylene Uniweld handle and braze large copper joints. Skip it if you use a propane torch or need a general-purpose cutting or welding tip.
Uniweld MTF-9 at a Glance
| Item | Per the listing and Uniweld |
|---|---|
| Type | Multi-flame wraparound brazing tip |
| Fuel | Oxy-acetylene |
| Reference pressures | About 10 PSIG oxygen, 7 PSIG acetylene |
| Acetylene use | About 5 to 9 SCFH |
| Flame angle | 40 degrees |
| Brazing capacity | Copper tube up to 2 in |
| Verify | Handle model and adaptor |
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What It Is and Who It Suits
The Cap’n Hook is a hooked tip with multiple small flames arranged so they curve around the tube. The flame angle is designed to flow toward the copper and away from nearby parts. That makes heating larger fittings faster and more even than using a single flame tip.
It suits refrigeration and HVAC contractors brazing larger copper tube joints. Hobbyists who solder small plumbing parts do not need it. The tip burns acetylene with oxygen, so the whole setup needs the right regulators, hoses and flashback protection.
How to Check It Fits Your Setup
- Handle: Uniweld lists the MTF series for several of its handles, some needing an adaptor. Match your handle model before ordering.
- Fuel: Oxy-acetylene only. Propane and MAPP tips are different.
- Regulators: Use oxygen and acetylene regulators that hold the low pressures called for. Never exceed 15 PSI acetylene working pressure.
- Tube size: The listing mentions brazing up to 2 inches of copper. Smaller tube can use less heat.
- Seals: The listing mentions O-ring seals; inspect them for wear when you swap tips.
- Fit-up: Wraparound heat is only as good as joint cleaning, fit-up and flux.
Pros and Limitations
Pros
- Wraparound flame heats large copper tube more evenly.
- Directed flame angle helps keep heat off nearby components.
- Built from stainless steel and brass per the listing.
Limitations
- Needs a compatible oxy-acetylene handle and regulators.
- Not a cutting or steel-welding tip.
- Overkill for small tube and occasional jobs.
Using It Safely
- Follow the Uniweld pressure guidance and set the flame neutral or slightly carburizing as recommended for brazing copper.
- Keep the flame moving and heat the fitting before adding filler.
- Protect nearby valves, wiring and insulation with heat shields or wet rags where practical.
- Use safety glasses with shaded lenses for gas work, plus leather gloves.
- Leak test the handle, hoses and regulators with soapy water before lighting.
- Do not drill out tip orifices; clean them with the proper tip cleaner.
Brazing Technique With a Wraparound Tip
Clean the tube and fitting with abrasive cloth, apply flux if your filler needs it, and assemble the joint. Hook the tip around the tube, heat until the flux turns clear, then touch the filler to the joint, not to the flame. Capillary action should draw the filler in. Remove the heat as soon as the joint fills, and let it cool before wiping off flux residue.
If the filler balls up or runs away, the joint is probably too cold on one side, dirty or poorly fitted. Reheat evenly rather than adding more filler.
Alternatives and Related Guides
- For another air-acetylene option, see the TurboTorch TDLX 2010B carrier kit review.
- A small brazing outfit is covered in the Kodilin brazing torch kit review.
- Uniweld also appears in the Uniweld RO100 oxygen regulator review.
- For brazing rod information, see the brass brazing rods review.
Frequently Asked Questions
What fuel does the Uniweld MTF-9 Cap’n Hook tip use?
Uniweld lists the MTF series for oxy-acetylene use. The manufacturer page gives about 10 PSIG oxygen and 7 PSIG acetylene for the MTF-9, with acetylene consumption of roughly 5 to 9 SCFH. Do not use it with propane or other fuels unless Uniweld says so.
What tube size can it braze?
Uniweld lists the MTF-9 for brazing copper tubing up to 2 inches. Larger fittings take longer to heat and may need a bigger tip or a second pass. For thin tube, the wraparound flame can heat quickly, so keep the torch moving.
Which handles fit the MTF-9 tip?
Uniweld lists the MTF series for handles such as the 71, WH250, WH550 and WH350 (with an F15 adaptor), but that list covers the series, not necessarily every size. Confirm your handle model and thread with Uniweld or the seller before ordering.
Why use a wraparound brazing tip?
A multi-flame hook tip heats around the tube at once, which reduces how much you need to move the torch. That helps keep the joint temperature even and reduces the risk of overheating one spot. You still need clean, fluxed joints and good joint fit-up.
Verdict
The MTF-9 is a specialist brazing tip for oxy-acetylene users working on larger copper tube. Check handle compatibility and the current listing before ordering.
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